Question

我有一个数组，我想从中创建一个带有键值对的新数组。我想我知道需要什么，我只需要一些语法帮助。

foreach ($stuff as $thing){
    $thing1 = $thing->prop1;
    $thing2 = $thing->prop2;
    // this is where I need to set $newstuff = array($thing1 => $thing2);
    $newstuff[] = ??
}

Answer 1

这样做：

foreach ($stuff as $thing){
    $thing1 = $thing->prop1;
    $thing2 = $thing->prop2;
    // this is where I need to set $newstuff = array($thing1 => $thing2);
    $newstuff[$thing1] = $thing2;

}

Answer 2

可以使用array_map()代替foreach()。例如：

$newstuff = array_map(function($v){return array($v->prop1=>$v->prop2);}, $stuff);

使用foreach()：

foreach ($stuff as $thing){
    $newstuff[] = array($thing->prop1=>$thing->prop2);
}

Answer 3

$newstuff = array();
foreach ($stuff as $thing){
    $thing1 = $thing->prop1;
    $thing2 = $thing->prop2;
    // this is where I need to set $newstuff = array($thing1 => $thing2);
    $newstuff[] = array($thing1 => $thing2);
}

或

$newstuff = array();
foreach ($stuff as $thing){
    $thing1 = $thing->prop1;
    $thing2 = $thing->prop2;
    // this is where I need to set $newstuff = array($thing1 => $thing2);
    $newstuff[$thing1] = $thing2;
}

取决于期望的结果......

Answer 4

$newstuff = array();
foreach ($stuff in $thing) {
   $newstuff[$thing->prop1] = $thing->prop2; 
}

或

$newstuff = array();
foreach ($stuff in $thing) {
   $newstuff[] = array($thing->prop1, $thing->prop2); 
}

全部取决于您是否要保存在数组中。

PHP通过每次循环迭代向数组添加键值

4 个答案: